Agent Payments Protocol (AP2)
./PayOpen protocol using signed mandates so agents can transact within user-defined limits, with x402 and card rails
llms.txtAP2x402
$ protocol support
$ payment protocols
AP2Agent Payments ProtocolGoogle · authorization
Cryptographic mandates signed by the buyer, proving an agent had authority to spend within set limits
x402x402Coinbase, x402 Foundation · settlement
HTTP 402 standard for per-request stablecoin payments between an agent and an API
$ agent access
authWallet
onboardingFull — agent can self-onboard
tosExplicitly welcomes bots
webhooksNo
free tierYes
billingper-transaction
#ap2#mandates#protocol#google#agent-payments
https://ap2-protocol.org
// last verified 8/26/2026
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